The present application relates to magnetic components employed in switching power supplies. The method compares the indicia of signal quality to a signal threshold. Further, the cyber mall server generates display information from the cyber shop information composed of a shop management database, a shop layout database, an electronic shopping cart electronic form database, an electronic shopping care database, and a goods database by a parameter analyzing unit, a file retrieving unit, and a display data generating unit. The isolating region 9c and an intermediate region 9 are connected by a wiring resistor, or a diffused resistor 11c in the SOI substrate. Coating material is discharged from the slit while applied with pressure, so that the coating material is coated while expanded wider than the width of the slit.